tribal-warrior
Member
I was browsing through the Panasonic G2 instruction manual and I was surprised by what I read with regards to zooming and focusing. The manual advised that if you have zoomed after you focused, you should focus again. All true zoom lenses should retain focus while you zoom. There should be no need to refocus after zooming. I believe that there is a cheaper type of lens known as a vari-focal lens which does shift focus during zooming. Apparently, the kit lens of the Canon XL1 video camera was prone to this.
I did some testing with my G2 and the 14-45mm lens, focusing and then zooming in and out multiple times and it looks like the focus setting was retained. I wonder if the same can be said of the other Panny zooms made for the 4/3rds format. There's got to be a reason why Panasonic gave this advice in the manual....though I do find it hard to believe that they would incorporate such cheap lens designs in their 4/3 system. Then again, Canon did with for their flag ship semi-pro video camera.
I did some testing with my G2 and the 14-45mm lens, focusing and then zooming in and out multiple times and it looks like the focus setting was retained. I wonder if the same can be said of the other Panny zooms made for the 4/3rds format. There's got to be a reason why Panasonic gave this advice in the manual....though I do find it hard to believe that they would incorporate such cheap lens designs in their 4/3 system. Then again, Canon did with for their flag ship semi-pro video camera.
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